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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e068019a71a0c4688132e449e5033637c2fd249b6e5b72eba24358cb7098448' 
  AND token = 'ehLlv5wl390EbDrui21oiUizlzx4E5WiUuolTrGAOpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}